DISCLAIMER
Underground Service Locators (USL) provides Ground Penetrating Radar (GPR). USL cannot guarantee it will be able to locate all utilities or other
objects on site. The decision to proceed with cutting, coring, drilling, boring, or excavation is left entirely up to the customer. We do not conduct a study, investigation, analysis, or interpretation of soil composition, soil conditions, or other aspects of the physical earth. We report retrieved data only. We do NOT provide geophysical, geological, engineering, or land surveying services. Please contact a geophysicist, geologist, engineer, or land surveyor if you are seeking the provision of geophysical, geological, engineering, or land surveying services.
1.Underground Service Locators (USL) requires clear and uninterrupted access to the work area and expects all work available in one mobilisation unless otherwise specified.
2.Clear and uninterrupted access means no obstructions (equipment, vehicles, supplies, furniture, shrubbery, etc.) in the target areas to be scanned. Surface must be free of obstructions to allow any equipment to roll freely. Proposal is based on scanning the immediate area described, additional scanning may affect price.
3.Any generated reports will be based on USL’s interpretation of the data collected and are provided solely for illustration and instructional purposes. Reports are provided only if itemised as a deliverable in this proposal.
4.Due to the size and shape of the GPR, scanning is limited in the area immediately adjacent to a wall. Please discuss job conditions with USL representative. Scanning at depths greater than 12’ requires mobilisation of larger equipment at additional cost.
5.GPR scanning cannot be performed in areas with standing water.
6.GPR scanning of soils cannot be performed immediately after rainfalls.
7.Although USL uses only state-of-the-art GPR scanning equipment and techniques, and provides ongoing GPR training for its operators, locates are only as accurate as the information imaged by the radar, i.e., GPR scanning does not see everything all the time. Every effort is made to minimize missed targets by collecting and assessing all available information relative to the job site, including layout and configuration of the area to be scanned, existing drawings, historical knowledge of personnel, and prior experience with similar sites.
8.Data Collection Equipment is a commercial broadband pulsed radar system using 1500 or 400 Mhz antenna (s) with survey wheel encoder.
DO I NEED TO SCAN CONCRETE BEFORE CUTTING, CORING, OR DRILLING?
Saw cutting or core drilling into concrete slabs can pose a great deal of safety issues for your projects and your team if you are unaware of what dangers are lurking within the concrete slab. Anytime a project calls for concrete to be cut or drilled, you have the potential to damage the following if…
Ferro Scanning is an easy, non-destructive method of locating steel reinforcement in concrete structures. Ground Penetrating Radar (GPR) allows us to accurately locate post tension, rebar (single & multi-mat grids), conduits, determine grouted and un-grouted cells within concrete masonry walls and provide our clients with an approximate depth.
Our services include:
•Determine Concrete Thickness
•Column and beam scanning
•Mark Rebar location prior to drilling
•Mark out conduits within slab
•Void Detection in concrete masonry wall and concrete pavement
LIMITATIONS
Some common limitations encountered when using GPR:
1.GPR does not measure diameter of objects, just their location. When marking information from hyperbolasin line scan mode, allow some margin on each side of the marks. When viewing plan map images, remember these are pseudo-images. If the floor is marked as wide as the object width on the screen, this indicates to the coring operator to stay clear of that width when coring.
2.Bottom of slab is sometimes not easy to see in slab-on-grade situations. This is due to the interference ofthe wire mesh and the weak reflection from the concrete-gravel base interface.
3.Be aware of certain conditions that make using GPR very difficult. These include, but are not limited to, freshly-poured concrete, concrete containing metal fibers, fine-mesh screenings beneath tile,Styrofoam between slabs or on roofs.
CLIENT / CONTRACTOR NOTES
1.Underground Locators Ltd requires clear and uninterrupted access to the work area and expects all work available in one mobilization unless otherwise specified.
2.Clear and uninterrupted access means no obstructions (equipment, vehicles, supplies, furniture, shrubbery, etc.) in the target areas to be scanned. Surface must be free of obstructions to allow the antenna to roll freely. Proposal is based on scanning the immediate area described, additional scanning may affect price. Underground Locators Ltd may assess an hourly fee for down time occurring at no fault of its own.
3.Any generated reports will be based on Underground Locators Ltd’s interpretation of the data collected and are provided solely for illustration and instructional purposes. Reports are provided only if itemised as a deliverable in this proposal.
4.Due to the size and shape of the antenna, GPR scanning is limited in the area immediately adjacent to a wall. Please discuss job conditions with Underground Locators Ltd representative. Scanning at depths greater than 300mm requires mobilization of a larger antenna at additional cost.
5.GPR scanning cannot be performed in areas with standing water.
6.GPR scanning of soils cannot be performed immediately after rainfalls.
7.Although Underground Locators Ltd uses only state-of-the-art GPR scanning equipment and techniques, and provides ongoing GPR training for its operators, locates are only as accurate as the information imaged by the radar, i.e., GPR scanning does not see everything all the time. Every effort is made to minimise missed targets by collecting and assessing all available information relative to the job site, including layout and configuration of the area to be scanned, existing drawings, historical knowledge of personnel, and prior experience with similar sites.
8.Data Collection Equipment is a commercial broadband pulsed radar system using 1500 or 400 Mhz antenna (s) with survey wheel encoder.
Disclaimer: UNDERGROUND LOCATORS LTD MAKES NO, AND HEREBY EXPRESSLY DISCLAIMS ALL, WARRANTIES, EXPRESS OR IMPLIED, WITH RESPECT TO THE NATURE, QUANTITY OR QUALITY OF THE SERVICES TO BE PERFORMED HEREUNDER. EXCEPT TO THE EXTENT OF ITS GROSS NEGLIGENCE OR WILLFUL MISCONDUCT, DSI SHALL NOT BE LIABLE TO THE CUSTOMER FOR ANY DAMAGES AS A RESULT OF ITS PERFORMANCE OR FAILURE TO PERFORM THE SERVICES. THE STRUCTURAL SURVEY REPORT IS BASED UPON DSI’S INTERPRETATION OF THE DATA COLLECTED AND IS PROVIDED SOLELY FOR ILLUSTRATION AND INFORMATIONAL PURPOSES. UNDERGROUND LOCATORS LTD IS NOT RESPONSIBLE FOR ANY LOSS OR DAMAGE CAUSED, ARISING OUT OF THE USE OF, OR RELIANCE ON THE DATA COLLECTED OR THE REPORT GENERATED.